ELECOMTrackball Mouse Wireless, Ergonomic Mouse, 3 Device Connection, Wired (USB), Bluetooth, Track Ball Mouse, Thumb Control, Compatible for PC, Laptop, Mac, Windows, macOS, EX-G Pro (M-XPT1MRXBK)

The Logitech MX Ergo is a very good Thumb ball with a very good warranty. This one is just that much better in every regard. More ergonomic and more precise. Dare I even say you could game with this. Almost all trackballs require registry hacks for speed, acceleration and breaking. This works out of the box on one of your preferred 3 settings. I suggest if you use it wired you get a good heavy duty USB cable. This is also built better than any other track ball in my opinion. I prefer thumb to palm or fore finger. Just a preference. Do not believe any articles stating they will cause thumb injury. They simply cannot because there is nearly no resistance on the ball. Plus you are barely moving your thumb. You use your thumb more everyday regardless. This rides on synthetic rubies and the optical sensor is tuned to their ball. Yet, the ball has "micro" indents. So it has per pixel accuracy. Personally it fits me like a glove. The tenting is just right for me. The Logitech is too little flat and too much inverted. This is also much better at keeping out gunk and easier to remove the ball when need be. Furthermore the ball is heavier for more inertia but breaks very accurately.I want everyone to be aware this has NO warranty outside of Japan! If you are a hard core user,coder plan to be buying 1 or 2 per year which is par for the course. There is a more expensive model of this on Amazon with one letter missing in the part number. Also be aware per Elcom's website it is the same exact model for the same Yen. Yes, it is made in Japan not China. I am not sure why there are duplicate models. Save your money. A different seller wants more money for the same thing. Since you will probably be replacing this frequently anyways unles you are capable of and wish to repair it. Then you could feasibly kep it in service a long time for low cost. It is just the switches that go and they are 40 cents each in low quantities from electronic parts suppliers. It is by no means low quality. It is just normal for any of these to last 6 months to a year at 14 hours of usage per day. I also like that it takes a standard battery. The highest real rating on a NIMH AA is 2800MAH. That will run for about 1.5 years in this! Logitech runs about 2-3 days and the battery is not replaceable. This is usually found for the equivalent of about $300USD in Japan, so here for $69 it is a very fine deal. I would equate this to Topre keyboards. If you are looking at this you are probably familiar with Topre as well. Same type of quality. I would not buy much into the bad reviews personally. There are alway's duds in which case you have 90 day's to return to Amazon. Or better yet purchase the inexpensive extended warranty it is going to offer you when you check out. It will probably be worth your while. One thing I do not understand is here on Amazon the picture states the switches are rated 100,000 clicks. Elcom's website says 10,000. They are indeed Omron switches which are in fact rated for 10,000 clicks but that is actually more than you might realize. In summary I will say that this is the best Thumb ball that I am aware of if you prefer to use a thumb ball. If you are a heavy user you should not be using a mouse due to repetitive motion injuries which are no joking matter. I personally prefer a Thumb ball to all other types of pointing devices but what suites me may not suit you. Elcom also makes a Forefinger model of this which is fine as well. Just make sure you get the "G-Pro" line from Elcom. That is top of the line. One last thing. It says it has 8 buttons. They do not count the tilt as Logitech does so in that case it has 11. As far as I am aware it has more buttons than any other track/thumb ball. There software does not provide for macros though. If you wish for that functionality you will require 3rd party mouse software which usually comes at a nominal costIn closing most certainly 5 stars from me. Could not be happier with this device.

A week into using and I'm overjoyed...I'll update in 90 days and then again at 120 days...I've also added a few photos - one of JUST the trackball, a second with my large goofy hand on it for size reference, then another next to my Logitech Trackman (c.2004) for size reference, and finally a photo of the trackball next to a wireless mouse (again for size reference)Ok, so...I had searched for a long time for a halfway decent thumb trackball - I've been using my LOGITECH TRACKMAN since 2004 (new), and it's been a trooper. But a year ago I changed careers and wanted something a bit larger AND something that has a number of programmable buttons. So, to REDDIT I went, because, that's where you go when you want to find DETAILED reviews of something. And without spending a gigantic stack of cash, this little guy, the ELECOM EX-G PRO was referenced A LOT...at least until you got into the full hand trackballs from Kensington (which, to be perfectly honest, was a contender but it lost out for a tiny reason...I just didn't want to use a full hand trackball at work).So...SIZE - I'm 6'0" and 274 pounds and I have good sized hands (XL in gloves)...this trackball very comfortably holds my hand. My pinky finger doesn't fall off the side like most other trackballs. My thumb rests VERY comfortably on/near the ballFEEL - Not a "Cheap" feel, but not an "Expensive" feel..."expensive" is relative as I paid $69 for this. My budget was $120 or less and the closer I inched to $100...well, let's just say it had better be outstanding in design and function. The outer shell of the trackball has some texture to it...not rough but not exactly smooth. You'll feel it, which is good.FUNCTIONALITY - With EIGHT programmable buttons, it was exactly what I was looking for. Now, my day isn't as serious of a day as it used to be (Former tech/systems designer/implementation specialist for a large tech company) as I'm now in finance...so what I wanted to program on it was simply media functionality for music and opening several folders rather than clicking on them...I wanted to streamline my morning reports...and this little guy nailed it out of the park.My programmed buttons:-Just under thumb: Play/Pause-Just above thumb: Forward/Back pages-Under scroll wheel: Next-Button next to Right-Click: MuteScroll (Depress): Opens reports folderI don't use three available buttons as of yet.For gaming, the DPI is as follows: 500/1000/1500It's also a combo for connection meaning you have your choice: wired via a USB-C, Wireless Dongle, or Bluetooth.The Left, Right, and "Alternate" button (Where your pinky finger would rest) are very "clicky" sounding, like a standard basic mouse, but this doesn't bother me.Packaging was great, EXCEPT that the ENTIRE box was in another language. IN fact, the massive folded instruction guide was in several languages except English...but this isn't a big deal as it was on their website in English, so, no big deal.SOFTWARE - Download their "Mouse Assistant" software and immediately change it to your language as it defaults to something else. This is where you assign all the functions of the mouse and...there are A LOT of options.WHAT I DON'T LIKE - And it's something minor, really...the scroll wheel has a **VERY MINOR** delay...as in, you feel three tiny increments of a spin before the page scrolls. That's kind of a biggie for me and I haven't been able to find a way to adjust it so this is smooth in the software. My Logitech Trackman has a VERY smooth scroll...I'm not a fan of "bump" feel of rotation on a scroll wheel...and it's the only reason I dropped the rating to a 4-Star. It's a personal preference thing, but something that makes me also scrunch my nose at it when working.Overall, I will more than likely purchase another for my home system but will primarily use it for gaming. I really like the feel; the ball is SUPER SMOOTH and super fast whereas others have a "breaking in" period where the ball feels like there are grains of sand around it which keeps the ball from moving with ease and are no where near as fast (Adjustable in the software).